Add type import eslint rule

[beeme1mr]

          @beeme1mr I will add [this rule](https://github.com/open-feature/js-sdk/blob/f6bc6951a32fbbed9b35c1bdfd023b02874b87a1/.eslintrc.json#L15-L22) in a separate PR, which will impact probably everything in this repo, so we can't do it in this PR.

Originally posted by @toddbaert in #1203 (comment)